Does Spray Coverage Influence Fungicide Efficacy Against Dollar Spot?

Vincelli, Paul; Dixon, Ed

doi:10.1094/ats-2007-1218-01-rs

Cited by 12 publications

(10 citation statements)

References 1 publication

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“…In addition to the assay and analytical method, inconsistent fungicide deposition and sampling techniques may have also contributed to the observed variability. Vincelli & Dixon () demonstrated that fungicide coverage on a two‐dimensional paper surface was ‘near complete’ using air‐induction nozzles similar to those used in the present study. However, fungicide coverage within a three‐dimensional turfgrass plant and over an experimental area may be significantly less than complete and may have contributed to the observed variability.…”

Section: Discussionmentioning

confidence: 64%

Snow cover has variable effects on persistence of fungicides and their suppression of microdochium patch on amenity turfgrass

2015

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Fungicides applied to turfgrass in temperate climates prior to snowfall are expected to suppress fungal diseases such as microdochium patch (Microdochium nivale) until infection conditions become unfavourable the following spring. However, mild winters with inconsistent snow cover may alter fungicide persistence and render the turf more susceptible to fungal infection. This study was conducted to determine the effect of snow cover on the persistence of the fungicides chlorothalonil and iprodione applied to creeping bentgrass (Agrostis stolonifera), maintained as a golf course fairway. The fungicides were applied 1 day prior to the first accumulating snowfall in Madison, Wisconsin, for four consecutive winters, beginning in 2009/10. Fungicide treatments were kept under continuous snow cover or maintained free of snow cover the entire winter to determine the effect of snow cover on fungicide persistence (2010/11 to 2012/13) and microdochium patch development in a controlled environment chamber (2009/10 to 2012/13). Iprodione concentration was not impacted by snow cover in 2010/11 but was reduced under snow cover relative to bare turf in 2011/12 and 2012/13. Chlorothalonil concentration was not impacted by snow cover in 2011/12 but was greater under snow cover in 2012/13. Microdochium patch severity in the controlled environment chamber was not impacted by snow cover with either fungicide in 2009/10 or 2011/12 but was slightly reduced under snow cover with both fungicides during 2010/11 and 2012/13. The majority of fungicide depletion occurred shortly after rainfall or snowmelt events, except in 2010/11 when both fungicides rapidly depleted during a warming trend without rainfall.

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Section: Discussionmentioning

confidence: 64%

Snow cover has variable effects on persistence of fungicides and their suppression of microdochium patch on amenity turfgrass

2015

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“…1). Vincelli and Dixon (17) demonstrated a similar overall pattern for TurfJet and XR nozzles at 1.5 gal/1000 ft². In the present study, the Air Induction and Turbo Drop Twin Fan created a blend of larger and smaller droplets.…”

Section: Influence Of Nozzle Type and Water Volumementioning

confidence: 74%

“…While these studies provide insight into dollar spot control, there is a lack of information on the effect of spray volume in combination with different nozzle types. Spray technology for turfgrass applications, however, has received some recent attention in research (3,4,5,6,8,17) and trade (13,18) publications. However, there is still a need for more information.…”

Section: Introductionmentioning

confidence: 99%

Effect of Nozzle Type and Water Volume on Dollar Spot Control in Greens-Height Creeping Bentgrass

Kennelly

Wolf

2009

Applied Turfgrass Science

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A field study was conducted in 2007 and 2008 to determine the influence of nozzle type and water volume on the control of dollar spot of greens‐height creeping bentgrass, caused by Sclerotinia homoeocarpa F. T. Bennett. The nozzles utilized were XR, TurfJet, Air Induction, Turbo TwinJet, and Turbo Drop Twin Fan, all producing flat spray patterns. For each nozzle type, three flow rates were used to produce water carrier volumes equivalent to 0.5, 1.0, or 2.0 gal/1000 ft². Chlorothalonil (1.8 oz/1000 ft²) was applied on a 14‐day interval. Disease was assessed by counting the number of dollar spot infection centers in plot centers where spray coverage was complete. Overall, all nozzles except for TurfJet provided similar dollar spot suppression, and water volume was rarely a factor. On one rating date in 2007, all nozzle‐volume combinations reduced dollar spot compared to untreated turf except for the TurfJet nozzles at the lower water volumes. On one date in 2008, all nozzle and volume combinations reduced dollar spot compared to untreated turf, with the exception of plots receiving fungicide through XR and TurfJet nozzles at 0.5 gal/1000 ft² or Air Induction nozzles at 1.0 gal/1000 ft². Therefore, the use of a reduced water volume and an air induction drift reducing nozzle may be a practical option for managing dollar spot with a contact fungicide in creeping bentgrass.

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“…Other than chlorothalonil providing improved dollar spot control in Crenshaw using the low spray volume in 2008, chlorothalonil results do not fully support the findings of McDonald et al (9). Improving spray coverage can enhance dollar spot control with fungicides (11). McDonald et al (9) applied the fungicides at right angles, which likely improved coverage versus a one direction application.…”

Section: Summary and Recommendationsmentioning

confidence: 99%

Early Curative Dollar Spot Control in Creeping Bentgrass as Influenced by Fungicide Spray Volume and Application Timing

Pigati

Dernoeden

Grybauskas

2010

Applied Turfgrass Science

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The importance of spray volume and application timing of a fungicide targeting dollar spot (Sclerotinia homoeocarpa F. T. Bennett) has been investigated, but with conflicting results. The objectives of this field study were to assess the influence of two spray volumes (468 and 935 liters water/ha) and two application timings (AM to a canopy wet with dew versus PM to a dry canopy) for fungicides targeting dollar spot curatively. Chlorothalonil (8.5 kg a.i./ha), propiconazole (0.5 kg a.i./ha), and a tank‐mix of chlorothalonil + propiconazole were compared on fairway height stands of ‘Crenshaw’ (2007 and 2008), ‘Backspin’ (2008), and ‘Providence’ (2009) creeping bentgrass (Agrostis stolonifera L.). There were no spray volume differences in 2007 or 2009. In 2008 in Crenshaw, there was less dollar spot in chlorothalonil‐treated plots using the low versus high spray volume, but the opposite occurred in Backspin. Less dollar spot developed in propiconazole‐treated plots subjected to the low versus high spray volume in Crenshaw in 2008. Higher levels of dollar spot developed in plots treated with propiconazole in the PM compared to the AM in 2009. The tank‐mix of chlorothalonil + propiconazole was unaffected by spray volume or application timing at all sites. The preponderance of data indicated that the curatively applied fungicides generally provided similar levels of dollar spot control at the two spray volumes and application timings evaluated.

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Does Spray Coverage Influence Fungicide Efficacy Against Dollar Spot?

Cited by 12 publications

References 1 publication

Snow cover has variable effects on persistence of fungicides and their suppression of microdochium patch on amenity turfgrass

Snow cover has variable effects on persistence of fungicides and their suppression of microdochium patch on amenity turfgrass

Effect of Nozzle Type and Water Volume on Dollar Spot Control in Greens-Height Creeping Bentgrass

Early Curative Dollar Spot Control in Creeping Bentgrass as Influenced by Fungicide Spray Volume and Application Timing

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